A process for cracking a hydrocarbon material in two separate reaction zones, each of which contains a different crystalline aluminosilicate zeolite, one of such zeolites having a pore size of less than 6 Angstrom units and the other of such zeolites having a pore size greater than 8 Angstrom units.

Catalytic conversion of hydrocarbons

The present invention in its specific aspects relates to the catalytic conversion of hydrocarbons into lighter hydrocarbons of lower-boiling point or hydrocarbons otherwise altered in structure. In certain of its aspects the invention is particularly concerned with hydrocarbon conversions...

Fluidizing process and mechanism

This invention relates to a process for controlling the temperature of chemical reactions and pertains more particularly to a method of and apparatus for adding or extracting heat from a reaction zone and for maintaining the temperature within said zone within extremely narrow limits. The...

Controlling reaction temperatures

A method and associated apparatus for carrying out fluidized bed combustion and transferring heat produced thereby to a boiler includes providing a fluidized bed of particulate matter and introducing fuel particles thereinto, causing a portion of the fluidized bed constituents to flow upwardly through a heat exchanger which is essentially free of any obstructions to said flow, and reintroducing the portion of fluidized bed constituents which flow through the heat exchanger, back into the fluidized bed. As preferably embodied, the portion of fluidized bed constituents flows into an inlet at the bottom of the heat exchanger from a quiescent zone adjacent the combustion bed and a gas having a combustible component is introduced into the heat exchanger. Advantageously, additional fuel particles are also introduced into the heat exchanger to flow upwardly therethrough. Also advantageously, the cross-sectional area of the flow path provided in the heat exchanger is proportioned to provide an essentially uniform temperature profile across the flowing particles at any position in the heat exchanger.

Fluidized-bed compact boiler and method of operation

This invention relates to a catalytic hydrocarbon conversion system and it pertains more particularly to improvements in a powdered or fluidtype system for separating catalyst from gases and vapors and for obtaining temperature control in a reaction or regeneration system. In the powdered...

Catalytic hydrocarbon conversion system

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Catalytic hydrocarbon conversion system